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services/web/test/frontend/utils/EventEmitterTests.js

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+import { expect } from 'chai'
+import sinon from 'sinon'
+
+import EventEmitter from '@/utils/EventEmitter'
+
+describe('EventEmitter', function () {
+  beforeEach(function () {
+    this.eventEmitter = new EventEmitter()
+  })
+
+  it('calls listeners', function () {
+    const cb1 = sinon.stub()
+    const cb2 = sinon.stub()
+    this.eventEmitter.on('foo', cb1)
+    this.eventEmitter.on('bar', cb2)
+
+    this.eventEmitter.trigger('foo')
+
+    expect(cb1).to.have.been.called
+    expect(cb2).to.not.have.been.called
+  })
+
+  it('calls multiple listeners', function () {
+    const cb1 = sinon.stub()
+    const cb2 = sinon.stub()
+    this.eventEmitter.on('foo', cb1)
+    this.eventEmitter.on('foo', cb2)
+
+    this.eventEmitter.trigger('foo')
+
+    expect(cb1).to.have.been.called
+    expect(cb2).to.have.been.called
+  })
+
+  it('calls listeners with namespace', function () {
+    const cb1 = sinon.stub()
+    const cb2 = sinon.stub()
+    this.eventEmitter.on('foo', cb1)
+    this.eventEmitter.on('foo.bar', cb2)
+
+    this.eventEmitter.trigger('foo')
+
+    expect(cb1).to.have.been.called
+    expect(cb2).to.have.been.called
+  })
+
+  it('removes listeners', function () {
+    const cb = sinon.stub()
+    this.eventEmitter.on('foo', cb)
+    this.eventEmitter.off('foo')
+
+    this.eventEmitter.trigger('foo')
+
+    expect(cb).to.not.have.been.called
+  })
+
+  it('removes namespaced listeners', function () {
+    const cb = sinon.stub()
+    this.eventEmitter.on('foo.bar', cb)
+    this.eventEmitter.off('foo.bar')
+
+    this.eventEmitter.trigger('foo')
+
+    expect(cb).to.not.have.been.called
+  })
+
+  it('does not remove unnamespaced listeners if off called with namespace', function () {
+    const cb1 = sinon.stub()
+    const cb2 = sinon.stub()
+    this.eventEmitter.on('foo', cb1)
+    this.eventEmitter.on('foo.bar', cb2)
+    this.eventEmitter.off('foo.bar')
+
+    this.eventEmitter.trigger('foo')
+
+    expect(cb1).to.have.been.called
+    expect(cb2).to.not.have.been.called
+  })
+})